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Windows 7: Both webcams stopped working

I have a Sony Vaio VPCEB. It has a built in camera at the top of screen (USB 2.0) and I also have an external webcam (microsoft LifeCam). Both were working fine until a month ago. But now they do not work. Can somebody help me find what can be wrong?

More details:
1. Both cams were working until a month ago
2. Both cams show up in Device manager under Imaging Device with status "This device is working properly."
3. None of my programs are unable to detect either of the cams (skype, google talk, ArcSoft Webcam Companion).

4. I had turned on a few services (because my computer became too slow), so I thought that could be the reason. So I tried turning on ALL the services, but no success.

Both webcams stopped working

webcams audio onlyhi i am running a windows 7 home premium 64 bit system with service pack 1 and all updates.
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Hardware & Devices

Government has acess to users webcamsUK, US spies hacked into webcam feeds of millions of Yahoo users | Fox News
US hacked and recorded millions of users with their webcams.
Seems the government has easy enough access to any computer running windows.
Is linux more secure, or is this exploit something to do with internet web?
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System Security

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General Discussion

Windows 7 and WebcamsGreetings All,
I am in the process of testing deployment of Windows 7 and Webcam functionality. I have so far tested 3 different webcams, Logitech c905, Logitech Webcam 9000, and a RocketFish webcam. All three exhibit the exact same problem. I attempted to test webcam functionality with...